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Commitments and Contingencies (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Jun. 30, 2013
Sep. 26, 2012
Healthcare Strategies, Inc., Plan [Member]
plantiff
Feb. 22, 2011
Healthcare Strategies, Inc., Plan [Member]
plantiff
Jun. 30, 2013
Investment purchase commitment
Dec. 31, 2012
Investment purchase commitment
Loss Contingencies [Line Items]          
Off-balance sheet commitment to purchase investments       $ 332.1 $ 314.9
Possible losses in excess of amounts accrued $ 40.0        
Sponsors of retirement plan alleging violation     2    
Number of plantiffs   15,000